effect of mineral and organic treatments of heavy metal concentratins in a soil polluted and radish shoots

this research was conducted on polluted soil near the lead and zinc factory in zanjan province through which the effects of two organic and three mineral sources were examined on heavy metals fixation in randomized experiment design. experimental treatments includes bagasse and rice husk in three levels: 1.25, 2.5 and 5%, zeolite in three levels: 5%, 10% and 15%, phosphate rock in three rates: 1%, 3% and 5%, triple superphosphate in three ratios: 0.0075, 0.015 and 0.3% accompanied with control treatment. the incubation period was performed in filed capacity moisture. after the incubation period the heavy metals concentration in soil were measured and the radish was planted. after harvesting the shoot the concentration of lead, zinc, iron and manganese in the shoot of radish were measured. the results of data analysis of variance showed that treatments had significant effect on reduction of iron, manganese and lead concentration in soil (extractable by nitric acid) and radish shoot. the most effective treatment on reduction of soil iron concentration was in the second level of rice husk. in manganese and lead concentration reduction was the third level of zeolite. the least concentration in radish shoot was observed in third level of bagasse treatment (460.7mg/kg), manganese in third level of zeolite treatment (370mg/kg) and lead (14.43 mg kg⁻¹) in third level of rice husk. according to the organic and zeolite treatment on heavy metal fixation in soil and reduction of plant uptake this treatment can be used to amend the lead polluted soil.